8 35. What is the size of the instruction queue? a) 4 bytes b) 6 bytes c) 8 bytes d) 2 bytes 36. What is the size of each segment in 8086? a)12kb b) 32kb c) 64kb d)128kb 37. Which micro processor accepts the program written for 8086 with out any changes a) 8085 b) 8087 c) 8088 d) Which are the basic parts of 8086? a) BIU b) EU c) pipelining d) a and b is bit microprocessor? a)8 b)16 c)20 d) Among all which one is co processor for 8086? a) 8085 b) 8087 c) 8088 d) How many general purpose registers available in 8086? a) 4 b) 8 c) 10 d) none reg (in 8086)contains the address of the next instruction to be fetched? a) bp b) sp c) pc d) ip 43. Which Segment is used to store interrupt and subroutine return address registers. a) ss b) es c) ds d) cs 44. Which Flag can be set or reset by the programmer and also used to control the operation of the processor? a) trace b) interrupt c) direction d) all 45. Give example of maskable interrupt? a) RST 7.5 b) RST 6.5 c) TRAP d) a and b 46. MOV Cx, 1234H instruction belongs to which addressing mode? a) Register b) memory c) direct d) Immediate instructions varied from to bytes? a) 1 to 2 bytes b) 1 to 3 bytes c) 1 to 4 bytes d) none prefetches only when at least bytes are free in queue. a) 4 b) 3 c) 2 d) 1

9 49. An RS-232 interface is a) a parallel interface b) a serial interface c) printer interface d) a modem interface has flag signals. (a) 3 b) 5 c) 7 d) 9 APTITUDE: 51. A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform? a) 120 m b) 240 m c) 300 m d) none of these 52. In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is: a) 3 km/hr b) 5 km/hr c) 8 km/hr d) 9 km/hr 53. If x=y=2z and xyz=256 then what is the value of x?. a)12 b)4 c)16 d)6 54. Pipe A can fill a tank in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins.if all of them work together, find the time taken to fill the tank. a) 17 1/7 mins b) 20 mins c) 8 mins d) none of these 55. There is an element which triplicates in every hour. Each of these 3 items in turn reproduce exactly 3 other items. If a single compound is kept in a container at noon and the container is full by midnight. At what time is the container 1/3 full. a) 4pm b) 6pm c) 9pm d) 11pm 56. Mr. Shah decided to walk down the escalator of a tube station. He found that if he walks down 26 steps, he requires 30 seconds to reach the bottom. However, if he steps down 34 stairs he would only require 18 seconds to get to the bottom. If the time is measured from the moment the top step begins to descend to the time he steps off the last step at the bottom, find out the height of the stair way in steps? a) 18 steps b) 25 steps c) 46 steps d) 32 steps 57. What is the missing number in this series? ?

10 a) 7 b) 5 c) 9 d) Can you find out what day of the week was January 12, 1979? a) Friday b) Saturday c) monday d) Wednesday 59. A person walking 5/6 of his usual rate is 40 minutes late. What is his usual time? a) Rs per kg. b) Rs per kg. c) Rs per kg d) Rs per kg 60. A garrison of 3300 men has provisions for 32 days, when given at a rate of 850 grams per head. At the end of 7 days a reinforcement arrives and it was found that now the provisions will last 8 days less, when given at the rate of 825 grams per head. How, many more men can it feed? a) 1540 men b) 1250 men c) 1700 men d) 250 men 61. The sum of a number and the number preceding it is 33. By how much is two less than six times the number? a) 196 b) 94 c) 90 d) If the length and breadth of a room are increased by y feet each, the perimeter increases by 16 feet. Find y a) 8 b) 2 c) 6 d) One-fourth of a number is greater than one-fifth of the number succeeding it by 1. Find the number. a) 24 b) 42 c) 36 d) An oil cylinder was 3/4th full. When two bottles of oil is poured into it, it is 4/5th full. How many bottles of oil can the full cylinder hold? a) 20 b) 15 c) 40 d) The ratio of present age of A and B is 4:3. A will be 26yrs old in 6yrs from now. How old is B now? a) 15yrs b) 20yrs c) 25yrs d) 10yrs 66. A profit of Rs. 500 is divided between X and Y in the ratio of ½ : 1/3.What is the difference between their profit shares? a) Rs. 200 b) Rs. 100 c) Rs. 300 d) Rs. 50

11 67. The sum of the present ages of A, B, C is 45 yrs. Three years ago their ages were in the ratio 1:2:3. What is the present age of A a) 10yrs b) 6yrs c) 8yrs d) 9yrs 68. If the denominator of a fraction is increased by 4, then the fraction becomes 5/8. If the numerator is 11 less than the denominator, find the numerator. a) 25 b) 20 c) 30 d) mangoes and 7-apples cost as much as 10-mangoes and 9-apples. What is the ratio of cost of one mango to cost of one apple? a) 2:5 b) 5:2 c) 3:4 d) Cannot be determined 70. A person sold his watch for 96 $ and got some percentage of profit which was numerically equal to the cost price. What is the cost price of the watch a) 50 $ b) 54 $ c) 60 $ d) 80 $ 71. Tap A can fill an empty tank in 6-hours and Tap B can empty the full tank in 8-hours. If the tank is empty when tap A is opened at 9:00 am and tap B is opened at 11:00 am, then at what time is the tank filled? a) 6:00pm b) 3:00 am c) 3:00pm d) 6:00am men can plant 50 saplings in 8-hours. In how many hours can 15men plant 80 saplings? a) 17 1/25 b) 12 7/11 c) 20 d) None of these 73. A man can row at 6 km/h in still water and at 4 km/h upstream. How long will the man take to go to a place 1 km downstream and return? a) 36 min b) 24 min c) 12 min d) 18min 74. Some telegraph poles are placed 20 m apart. How many poles will a train pass in 3- hours at 60km/h? a) 1200 b) 2500 c) 4000 d) The square of a two digit number is divided by half the number. After 36 is added to thequotient, this sum is then divided by 2. The digits of the resulting number are the same as those in the original number, but they are in reverse order. The ten's place of the original number is equal to twice the difference between its digits. What is the number? a) 38 b) 46 c) 27 d) 75

8086 Microprocessor Introduction 8086 is the first 16 bit microprocessor which has 40 pin IC and operate on 5volt power supply. which has twenty address limes and works on two modes minimum mode and maximum.

PART B QUESTIONS AND ANSWERS UNIT I 1. Explain the architecture of 8085 microprocessor? Logic pin out of 8085 microprocessor Address bus: unidirectional bus, used as high order bus Data bus: bi-directional

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Transparent Flip-Flop The RS flip-flop forms the basis of a number of 1-bit storage devices in digital electronics. ne such device is shown in the figure, where extra combinational logic converts the input

Interrupts The interrupt I/O is a process of data transfer where-by an external device or a peripheral can inform the microprocessor that it is ready for communication The interrupt requests are classified

Data Cables Data cables link one instrument to another. Signals can attenuate or disperse on long wires. A direct wire works best for short cables of less than 10 ft. A TTL cable connection can use a Schmitt

Converters In most of the cases, the PIO 8255 is used for interfacing the analog to digital converters with microprocessor. We have already studied 8255 interfacing with 8086 as an I/O port, in previous

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Chapter 11 Analog-Digital Conversion One of the common functions that are performed on signals is to convert the voltage into a digital representation. The converse function, digital-analog is also common.

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System Considerations Interfacing Performance Power Size Ease-of Use Programming Interfacing Debugging Cost Device cost System cost Development cost Time to market Integration Peripherals Different Needs?

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The information presented in this chapter is collected from the Microcontroller Architectural Overview, AT89C51, AT89LV51, AT89C52, AT89LV52, AT89C2051, and AT89C1051 data sheets of this book. The material